Tm-doped LuAG and LuSAG precursors were synthesized through a co-precipitation process, using ammonium hydrogen carbonate as precipitator. Single-phase cubic LuAG/Tm and LuSAG/Tm phosphors were obtained after calcinations at 1000^oC and 1200^oC, respectively. These powders could be easily sintered into corresponding transparent ceramic LuAG/Tm and LuSAG/Tm in H₂ atmosphere at 1850^oC. The PL excitation and emission spectra were recorded for both phosphors and ceramics. All emission spectra (λ_ex = 355 nm) show blue emissions at 455 and 460 nm corresponding to the Tm³⁺ transitions ¹D₂→³F₄ and ¹G₄→³H₆.

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